IRR BIA RTE 30 over Main Canal
FairValley County, Montana · 7.2 KM SW of Oswego · Structure no. 00000000000C616
- Built
- 1983
- 42 years old
- Condition
- Fair
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 42 ft
- 1 main span
- Daily traffic
- 225
- 2024 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 30 over Main Canal is a prestressed concrete stringer/multi-beam or girder carrying IRR BIA RTE 30 over Main Canal in Valley County, Montana. It was built in 1983, so it is 42 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 225 vehicles a day, roughly 10% of them trucks, projected to reach 263 by 2044. The structure is 42 ft (12.9 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA RTE 30 over Main Canal built?
It was built in 1983, making it 42 years old in 2025.
What condition is IRR BIA RTE 30 over Main Canal in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.
How much traffic does IRR BIA RTE 30 over Main Canal carry?
About 225 vehicles per day (2024 count), of which roughly 10% are trucks.
How long is IRR BIA RTE 30 over Main Canal?
The structure is 42 ft (12.9 m) long with a longest span of 40 ft (12.2 m) and a deck 34 ft wide.
Who owns IRR BIA RTE 30 over Main Canal?
It is owned by the Bureau of Indian Affairs.